When's the last time you thought about your bladder?Esthen Exchange In this Short Wave episode, Emily talks to bladder expert Dr. Indira Mysorekar about one of our stretchiest organs: how it can expand so much, the potential culprit behind recurrent urinary tract infections and the still-somewhat-mysterious link between the aging brain and the aging bladder.

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Our third birthday is coming up on October 15th, and we want your voice on our show! Send us a voice recording with your name, where you're located, a one-sentence birthday wish, and this exact sentence: "You're listening to Short Wave, from NPR." E-mail it to us at [email protected] and we may put it at the top of one of our birthday shows.

This episode was produced by Berly McCoy, edited by Gabriel Spitzer and fact checked by Brit Hanson. The audio engineer was Josh Newell.